“Hard to Say I’m Sorry” is a 1982 Billboard Hot 100 #1 hit ballad performed by American rock group Chicago, written by band member Peter Cetera and producer David Foster from the album Chicago 16, released in 1982. The song hit number one for two weeks on the Billboard Hot 100 chart on September 11 of that year. It was their first top 50 hit since “No Tell Lover” in 1978. (source: Wikipedia)

“If You Leave Me Now” is the title of a popular hit ballad by the American rock group Chicago, from their album Chicago X. It was written and sung bybass guitar player Peter Cetera and released as a single in July 1976.

It is also the title of a compilation album released by Columbia Records (Columbia 38590) in 1983.

The single topped the US charts on October 23, 1976, and stayed there for two weeks, making it the first number one hit for the group as well as hitting number one on the Easy Listening charts.[1] It also reached #1 in the UK on November 13, 1976, maintaining the position for three weeks. It was popular in multiple radio formats, and at one point during its peak listeners could hear it being played simultaneously on four different New York City radio stations.

“After All” is a 1989 Billboard Hot 100 Top 10 Hit song performed as a duet by American singer and actress Cher and American singer and bass playerPeter Cetera (former lead vocalist of Chicago), released on February 21, 1989 by Geffen Records. It was used as the love theme for the movie Chances Areand was nominated for Best Original Song at the Academy Awards 1989. The song was also the first North American single (promo in the rest of the world) release from Cher’s twentieth album Heart of Stone. The song was featured on Peter Cetera‘s album “Connection” without any mention of Cher’s name as a byline. Also, this song has been found to have headache-reducing powers due to its low frequency. (source: Wikipedia)